The simplest youtube-dl GUI you've ever seen!

youtube-dl homepage: https://youtube-dl.org/ zenity: https://help.gnome.org/users/zenity/stable/

The code (requires zenity, xdg-users-dirs tools, and of course youtube-dl itself):

#! /usr/bin/bash
set -eo pipefail

url="$(zenity --entry --title 'youtube-dl' --text 'Paste URL here:')"

selection=$(zenity --list --radiolist --hide-header --title 'youtube-dl' \
    --text 'Download video or only audio?' --column 'button' --column \
    'type' '' 'Video & Audio' '' 'Audio Only')

if [[ $selection == 'Audio Only' ]]; then
    opts='-x --audio-format best'
fi

destination=$(xdg-user-dir DOWNLOAD)

youtube-dl $opts "${url}" -o "${destination}/%(title)s.%(ext)s" \
    | zenity --progress \
             --title "youtube-dl" \
             --text 'Downloading...' \
             --pulsate \
             --auto-close \
             --auto-kill \
    && zenity --info \
    --ellipsize \
    --title 'youtube-dl' \
    --text "Downloaded to ${destination}"